EXPLODED VIEW · FRAME 000 / 095

IN DEVELOPMENT · EARLY ACCESS OPEN

APX-WEB-2026-10 · Rev C · APEXSDR

Eight coherent channels.Zero integration project.

A wideband coherent receiver where phase alignment is a property of the hardware; not a months-long systems project.

JOIN EARLY ACCESSSCROLL TO OPEN THE BOX

[ 01 / 03 ]SEALED

One box. Eight coherent channels.

[ 02 / 03 ]LID OFF

Eight shielded RF slices, fed by one shared LO.

[ 03 / 03 ]FULL STACK

120 × 180 mm · Kria K26 compute · 40GbE out.

THIS IS THE WHOLE INSTRUMENT

[ 01 ]

SPEC READOUT

Target specifications.

Design targets for the production unit; measured performance, with methodology, publishes when hardware ships.

8 CH

COHERENT RX

100 MHz

IBW / CHANNEL

32 CH

MULTI-BOARD

APEXSDR · DESIGN TARGETS08 ROWS

CHANNELS: 8 coherent RX
INSTANTANEOUS BW: 100 MHz per channel
RESOLUTION: 14-bit
FREQUENCY RANGE: 300 MHz to 6 GHz · bypass path below
BACKHAUL: 40GbE QSFP+ · 1GbE management
COHERENCE: Shared LO · auto re-cal on retune
MULTI-BOARD: REF / LO / PPS chaining; to 32 channels
TIMING: OCXO · ext 10 MHz · 1PPS · VITA 49.2

[ 02 ]

THE BOARD

The layout is the datasheet.

Everything the spec promises is visible in copper. Eight identical RF lanes across the front. One LO tree in the middle; that is the coherence. Four quad ADCs and the K26 module behind it, and a 40GbE cage on the way out.

Top-down rendering of the ApexSDR Rev 0.4 board layout: eight RF channel slices, shared-LO distribution tree, four quad ADCs, and Kria K26 module — FIG. 01 · REV 0.4 PROTOTYPE LAYOUTRENDERING, NOT A PHOTOGRAPH

Shared-LO backbone; one synthesizer, eight demodulators
Cal injection network; matched-length, pre-LNA
RF slices: SMA to zero-IF, one shielded lane per channel
Compute: Kria K26, quad ADC row, 40GbE out

[ 03 ]

COHERENCE

Aligned at the connector, not in your codebase.

Every channel sees the same local oscillator through a matched distribution tree, and a built-in pilot keeps the array aligned through retunes and temperature. What reaches your software is eight rows of samples that already agree.

FIG. 02 · ONE LO, EIGHT ROWS

8 × RX · ONE LO · ONE STREAM

EIGHT RECEIVERS · ONE CLOCK · ONE STREAM; THE PHASE ALIGNMENT IS THE PRODUCT

MULTI-BOARD

And it scales by cable.

Multi-box phase coherence is normally where coherent-array budgets go to die. ApexSDR carries reference, LO, and PPS in and out natively: chain boards with SMA jumpers and the stack behaves as one instrument. Thirty-two coherent channels is a parts order, not a program.

4 × APEXSDR · REF / LO / PPS CHAIN

32 COHERENT CHANNELS. SMA JUMPERS, NOTHING ELSE

[ 04 ]

SOFTWARE

Ships with Apexia Fabric.

Every unit includes Apexia Fabric; the software stack that turns aligned samples into working instruments. Ready-to-run reference designs for direction finding, TDOA, and spectrum monitoring; live debug and visualization; and a C API for building your own processing. No Vivado, no VHDL; aligned samples in minutes, not weeks.

Apexia.Fabric

Fabric is built by the same bench that ships our DSP cores; the pipelines are the product, not a demo.

EXPLORE APEXIA FABRIC · FREE BETA

[ 05 ]

DEPLOYMENTS

Built for.

01 / 04

Research instrumentation & radio astronomy

02 / 04

Direction finding & TDOA

03 / 04

Spectrum monitoring

04 / 04

RF emitter detection

[ EARLY ACCESS ]

FOUNDING INSTRUMENTS

First units go to founding instruments.

Research groups and teams who want eval hardware with white-glove bring-up from the engineers who built it. Join the list, or if you're building an instrument now, talk to us directly.

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